Cam.



C. IVI. SPENCER.

CAM.

APPLICATIONTILED DEC. 15| |914.

Patented July 13, 1915.

. www PLA-NOUN Z0-.WASHINGTON 9. C.

@messes `CHRISIIOEI'IIER lvLsPENCER, 0F HARTFORD, CONNECTICUT, ASSIGNOR TOTI-IE NEW BRITAIN MACHINE COMPANY, OFtNLEW BRITAIN, CONNECTICUT, A CORPORATION 0F CONNECTICUT.

CAM.`

rateiitefa .niiy is, iaia.

Original application filed September 28, 1914, Serial No. 863,956. Divided and this application filed December 15, 1914. Serial 110.877,333.

T0 all whom it may concern.'

Be it known that, I, CHRISTOPHER M. SPENCER, a citizen of the United States, residing at Hartford, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Cams, of which the following isa specification.

This invention relates to cams, the object of the invention being to provide an article of this character susceptible of general use and by which adj ustability of the active portion of the cam can be readily and quickly secured and adequately maintained without in any manner sacrificing strength.

In the drawings accompanying and forming part of the present specification I have shown in detail one of the several convenient forms of embodiment of the vinvention which to enable those skilled in the art to practice the same will be set forth fully in the following description. I do not restrict myself to this particular disclosure; I may depart therefrom in several respects within the scope of the invention defined by the claims following said description.

Referring to said drawings, Figure 1 is a -side elevation of a metal working machine equipped with a cam involving my invention. Fig. 2 is a sectional `view through the frame and tool carriage of the machine,

the upper part of the cam and certain` ad- Juncts, being elevation as` seen from the right in Fig. 1. Fig. 3 is a face view of a' part of the cam upon an enlarged scale, a shoe beingishown in dotted lines. Fig. 4 is a section on the line 4-4 of Fig.'3 and on the same scale as the latter.

Like characters refer to like parts throughout the several views.

The present case is a divisionof my contemporaneously pending application for patent for screw machine, filed September 28, 1914, Serial No. 863,956. l

As noted hereinbefore a cam comprising my invention can be employed in various connections, although it is of particular utility when incorporated in a metal working machine as shown in Figs. 1 and 2. In these two views parts of a lscrew machine are shown, and in such particularl use the cam is employed for operating the work carrier which as shown is in the form of a reciprocatory slide. As a matter of fact said line movement the slide 3 bendable by which adjustability is obtained.

Thisv effective portion of said cam.may be of any desirable type, although I prefer that it be in the nature of a peripheral or circumferential strip hugging or embracing the periphery of the body of the cam which in thepresent case is made in approximately cylindrical or drum form.

In Figs. 1 and 2 the framing of the machine is denoted in a general way by 2, being provided at its upper side with ways of proper kind to receive and guide for straight equipped at its front or inner end with a head 4. constituting a suitable `support for one or more tools. The cani is `denoted. by 5,being supported by the shaft 6 and having as shown the internal gear 7 driven from the pinion` 8 receiving its motion through suitable intervening mechanism from the driver 9 (shown as a pulley). The invention does not concern the driving mechanism for the cam, so that I have only briefly referred to the same. The body of the cam 5 is shown as consisting of a drum and as having` thereon two cam members 10 andll which` fit against the periphery of said drum and which act successively against a suitable projection as the shoe *12' pivoted yto and depending from the tool carrier or slideS, said slice asl will be obvious having a surface contact with the edge portions of the cam members 10 and 11.' The cani member 10encircles the body or drum of the cam 5 for practically the major part of the circumference thereof, be-

ing disposed as shown spirally of said body or drum. The forward or inner edge of said cam member 10 wipes against the projection or shoe 12, thus to move the carriage or slide 3 inwardly. Then the tail portion of the cam member 10 (the upper part of said cani member in Fig. l) passes free of the shoe 12, there is an interval until the cam 11 comes against said shoe, the cam 11 as will be inferred being provided to retract Vthe slide 3. The pitch of the cam member 10 is a very low one but extends over a considerable part of the outer surface of the body of the cam 5, by reason of which the full inward movement of the slide 3 is secured slowly. The pitch of the cam member 11, however, is very steep, so that When it acts against the shoe 12, the slide 3 Will be quickly retracted thereby.

As shown the slide advancing cam 10 is laminated or in layers. It is desirable if.

not essential, certainly so 1n some cases, that the cam member` 10 should be of a certain thickness in order to possess the requisite strength or resisting ability. If it Were in a single thick piece it Would be practically impossible to Wrap it tightly about the body or drum of the cam 5 on dierent spirals. By laminating the cam 10 I find that I can yeasily and readily bend or iieX the same to theprecise shape of the drum of the cam 5 at any place in the lateral extent of said drum and thus cause the cam member or laminated strip l0 to closely and substantially fit against said drum. As will be inferred the cam.member.10 is laterally adjustable'and the bolts 13 are provided in the present instance for maintaining the adjustment. By

laterally adjusting the cam the degree of movement of the slide 3 can be adjusted. I should also state that the bolts 13 in addi- Ation to maintaining the adjustment also clamp the sections of the member 10 together. As shown these bolts 13 project into T-slots 14 extending transversely of the periphery of the drum of the cam 5, the inner ends of said slots being closed and their outer ends open. The bolts 13 are provided with T-nuts 15 disposed in the T-slots 14 and When thebolts are set, the sections of the member or strip 10 are clamped together and said member 10 is also held in l its adjusted position. By backing out the v lcopies of this patent may be obtained for bolts 13 the cam member 10 Will be loosened sufficiently to permit lateral adjustment and justable cam-member resilient to conform to the drum m the various adjustments of said l cam-member.

j, 2. A ca m comprising a drum provided vWith a periphery-embracing, laterally-adthe cam member, and means for holding the cam member in its adjusted positions and for also maintaining the strips thereof in superimposed relation.

a. A cam comprising a drum provided with a periphery-embracing, laterally-adjustable cam-member consisting of several vsuperimposed strips and resilient to conform to the drum in the particular adjustment of the cam member, and means for maintaining the cam member in its various adjusted positions, the same means also maintaining the strips in superimposed relation.

5. A cam Vcomprising a drum provided With a periphery-embracing, laterally-adjustable cam-member resilient to conform to the drum in the various adjustments of said cam member, the latter consisting of superimposed strips, and bolts extending through the strips to maintain them in superimposed relation, the drum being transversely slotted to slidingly receive the bolts.

6. A cam comprising a drum provided with a periphery-embracing, laterally-adjustable cam-member resilient to conform to the drum in the various adjustments of said cam member, the latter consisting of superimposed strips, T-shaped grooves extending transversely of the drum, and bolts connecting the strips and provided With T-nuts fitted in said T-grooves.

7. A cam comprising a body and an active portion, the active portion being laminated and resilient to provide for adjustability, and means for maintaining said active portion in its various adjusted positions.

In testimony whereof I affix my signature in presence of two witnesses.

CHRISTOPHER M. SPENCER. IVitnesses L. L. MARKED, HEATH SUCH-IERLAND.

five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

